Sony XTL-W70 Service Manual page 10

XTL-W70
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Bright Adjustment (2)
Procedure:
1. Press the TV/VIDEO button (S106) to the VIDEO mode,
display the gray scale on the monitor screen.
2. Connect an oscilloscope to TP405 on the MONITOR board.
3. Adjust RV408 so that the signal level in the 5th stage from the
top is the specified value A.
Specified value A: 1.90 ± 0.04 V
(Skip item 3 and start from item 4 when the value cannot be
completely adjusted.)
4. Adjust RV406 so that the signal level in the 1st stage from the
top is the specified value B.
Specified value B: 3.64 ± 0.02 V
5. Adjust RV407 so that the signal level in the 3rd stage from the
top is the specified value C.
Specified value C: 2.98 ± 0.02 V
6. Repeat items 3 to 5 and adjust the signal in the 5th, 1st and 3rd
stages.
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B and R Level Adjustment
Procedure:
1. Press the TV/VIDEO button (S106) to the VIDEO mode,
display the gray scale on the monitor screen.
2. Connect an oscilloscope to TP405 on the MONITOR board.
3. Measure the black-to-black level.
4. Connect an oscilloscope to TP404 on the MONITOR board.
5. Adjust RV409 so that the black-to-black level A is the same as
the level measured in item 3.
6. Connect an oscilloscope to TP406 on the MONITOR board.
7. Adjust RV410 so that the black-to-black level is the same as the
level measured in item 3.
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